LESSON 21 · INTERMEDIATE · SHORT LESSON
Cavitation and Aeration
Cavitation involves vapour cavities forming at low local pressure; aeration involves gas entering from outside. They are different problems.
What is happening technically?
Verify suction pressure, operating oil viscosity and the pump manufacturer's inlet requirements together. Noise and foam alone do not confirm a diagnosis.
In practice
Higher suction resistance with cold oil may compromise the pump's inlet conditions.
Educational diagram only; not a manufacturing or safety circuit. The pilot line illustrates the line style only.
Symptom → check → solution
If movement, pressure or temperature changes, first identify the conditions in which the symptom occurs. Record existing gauge readings. Base maintenance or circuit examination on causes confirmed by measurements.
Select your symptom in Fault Hunter →Quick check
Which is the correct approach before replacing a component?